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 ###Instrução: qual é o número de passageiros quando a capacidade é de 81,2%?
 ###Tabelas: CREATE TABLE participation_and_medals (participation_and_medals_id AUTO_INCREMENT PRIMARY KEY, Games INT, First INT, Last INT, Gold INT, Silver INT, Bronze INT, Total INT, Best finish (first/last) VARCHAR) CREATE TABLE great_little_railways (great_little_railways_id AUTO_INCREMENT PRIMARY KEY, Episode No. INT, Episode Title VARCHAR, UK Broadcast Date VARCHAR, Narrator VARCHAR, Writer VARCHAR, Details of Journey VARCHAR, Countries Visited VARCHAR) CREATE TABLE brazil's_15_busiest_airports_by_passenger_traffic (brazil's_15_busiest_airports_by_passenger_traffic_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Location VARCHAR, Total Passengers INT, Annual change VARCHAR, Capacity in use VARCHAR) CREATE TABLE list_of_grand_crus (list_of_grand_crus_id AUTO_INCREMENT PRIMARY KEY, Grand Cru VARCHAR, Region VARCHAR, Village VARCHAR, Wine style VARCHAR, Vineyard surface (2010) VARCHAR) CREATE TABLE actual_examples (actual_examples_id AUTO_INCREMENT PRIMARY KEY, Birth Name VARCHAR, Birth Name As Announced in Latin (Accusative case Forename Undeclined Surname) VARCHAR, Papal Name VARCHAR, Papal Name As Announced in Latin VARCHAR, Latin declension of Papal Name VARCHAR, Numeral in Papal Name VARCHAR)  
SELECT SUM Total Passengers FROM brazil's_15_busiest_airports_by_passenger_traffic WHERE Capacity in use = 81.2%